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b.H₃PO₄ -> +3+P+(-8) = 0 -> P = +8-3 -> P = +5
c.Ca(ClO₃)₂ -> +4+2Cl+(-6) = 0 -> 2Cl = +6-4 -> Cl = +1
d.H₂C₂O₄ -> +2+2C-8 = 0 -> 2C = +8-2 -> C = +3